From: Chuck Church (cchurch@optonline.net)
Date: Fri Nov 15 2002 - 01:38:32 GMT-3
P.S. None of this applies in certain parts of the world:
http://news.com.com/2102-1033-965073.html
Chuck Church
CCIE #8776, MCNE, MCSE
----- Original Message -----
From: <dunne.brian@adlittle.com>
To: <jjrinehart@hotmail.com>
Cc: <ccielab@groupstudy.com>; <nobody@groupstudy.com>
Sent: Thursday, November 14, 2002 10:41 PM
Subject: Re: VoIP over IDSL/SDSL
> FYI: The Layer 1-7 protocols of Voice networks over IP is usually (when
> using H.323 ver 3/4):
>
> Layer 7--Voice
> Layer 6-Codec (G.711, G.723, G.729 etc.)
> Layer 5-H.323 & related (Media Gateway to Gatekeeper or MG to MG
> communication and authentication-signalling/call control over IP)
> Layer 4- RTP (adds tagging) over UDP
> Layer 3- IP
> Layer 2-You name it
> Layer 1- "
>
> More than you want to know:
> The "telco" networks that have performed Tandom offload often have MGCP (
> and many variants and updates) or SIP at Layer 4/5 as well. Note that
> Cisco has outsold the traditional Circuit-Switched Telco vendors (Lucent,
> Siemens, Nortel, Alcatel, Ericsson) recently for all types of "voice"
> equipment.
>
> http://www.xdsl.com/content/backgroundinfo/papers/ -xDSL white
> papers.
>
>
> Regards-
>
>
>
>
>
>
> "Chuck Church"
> <cchurch@optonli To: "Joseph Rinehart"
<jjrinehart@hotmail.com>, <ccielab@groupstudy.com>
> ne.net> cc:
> Sent by: bcc:
> nobody@groupstud Subject: Re: VoIP over
IDSL/SDSL
> y.com
>
>
> 11/15/2002 08:48
> AM
> Please respond
> to "Chuck
> Church"
>
>
>
>
>
>
> Joseph,
>
> I assume you're xDSL connections are to the Internet. If they are,
> there's not much difference between VoIP over that and any other physical
> topology. Latency and bandwidth are your big variables over the Internet.
> Do a traceroute and pings between your two proposed VoIP sites, and see
> what
> kind of ping times and hop counts you see. If the two sites are using the
> same ISP in the same town, you should get good performance. But different
> ISPs might mean 150 ms pings and 20 hops. Not real good for VoIP. CCO
has
> tons of articles about VoIP performance. Probably not many using xDSL,
but
> the same principals apply.
>
> Chuck Church
> CCIE #8776, MCNE, MCSE
>
>
> ----- Original Message -----
> From: "Joseph Rinehart" <jjrinehart@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, November 14, 2002 4:40 PM
> Subject: VoIP over IDSL/SDSL
>
>
> > Strange topic I know but are there any white papers regarding the
> viability
> > and mechanics or doinf VoIP over IDSL and SDSL lines? Sounds goofy but
> where
> > would info be on something like this?
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